Caliper Mapping and Transportation Glossary

DEFINITION

What is trip distribution?

Trip distribution models are used to predict the spatial pattern
of trips or other flows between origins and destinations. Models
similar to those applied for trip distribution are often used to
model commodity flows, retail trade, and store patronage.

TransCAD includes tri-proportional models
which allow for another dimension of constraints. In
tri-proportional models, groups of cells in the P-A flow matrix are
required to sum to specified values. TransCAD allows the additional
dimension to be applied for both growth factor and gravity models.

In addition to traditional trip distribution methods,
TransCAD supports modern distribution techniques based on discrete
choice frameworks to apply destination choice models at both
aggregate and disaggregate levels. Destination choice models include
shadow pricing options to ensure consistency between productions and
attractions.